linux-kernel - Re: [PATCH] kasan: Always respect CONFIG_KASAN

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Message-ID: <CA+fCnZc5=fqM=eEZ3RLqBFaxR72bjxndDdnM_rOkiSBi3+2L6A@mail.gmail.com>
Date:   Wed, 6 Oct 2021 13:57:28 +0200
From:   Andrey Konovalov <andreyknvl@...il.com>
To:     Nathan Chancellor <nathan@...nel.org>
Cc:     Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Marco Elver <elver@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Arnd Bergmann <arnd@...db.de>,
        kasan-dev <kasan-dev@...glegroups.com>,
        LKML <linux-kernel@...r.kernel.org>, llvm@...ts.linux.dev
Subject: Re: [PATCH] kasan: Always respect CONFIG_KASAN_STACK

On Wed, Oct 6, 2021 at 4:43 AM Nathan Chancellor <nathan@...nel.org> wrote:
>
> > This part of code always looked weird to me.
> >
> > Shouldn't we be able to pull all these options out of the else section?
> >
> > Then, the code structure would make sense: first, try applying
> > KASAN_SHADOW_OFFSET; if failed, use CFLAGS_KASAN_MINIMAL; and then try
> > applying all these options one by one.
>
> Prior to commit 1a69e7ce8391 ("kasan/Makefile: support LLVM style asan
> parameters"), all the flags were run under one cc-option, meaning that
> if $(KASAN_SHADOW_OFFSET) was not set, the whole call would fail.
> However, after that commit, it is possible to do this but I was not sure
> if that was intentional so I went for the minimal fix.

Ack. Filed https://bugzilla.kernel.org/show_bug.cgi?id=214629 for the rest.

Thanks!